Karolina Pliskova and Barbora Strycova pulled off back-to-back victories to clinch their first round tie for the Czech Republic against Spain and advance into an eighth straight semifinal.
WTA Staff

Fed Cup stalwarts Barbora Strycova and Karolina Pliskova clinched an unassailable 3-1 lead for defending champs Czech Republic over Spain.

Here's a full run down of the World Group I ties as they unfolded on Day 2:

Czech Republic 3-2 Spain

Pliskova kicked off the first reverse singles rubber against Garbiñe Muguruza after both emerged victorious in their opening matches on Saturday.

Playing at home in Ostrava, Pliskova had plenty of reason to feel confident after winning four of her last five matches over the reigning French Open champion.

After an hour on court, the Czech powerhouse put down the hammer on Muguruza, winning almost twice as many points and breaking serve five times for a 6-2, 6-2 win.

"My tennis was much better than it was yesterday so I enjoyed it more today," said last year's US Open runner-up. "I think she [Muguruza] doesn't like a fast game because she likes to dictate.

"I was serving well and you cannot do much about it if someone is serving well."

Next up was Strycova, who played a critical role in clinching the Czech team's third straight Fed Cup title over France. Up against Lara Arruabarrena, the veteran smacked a whopping 33 winners to just 21 unforced errors to assure victory with a 6-4, 7-5 triumph.

"This one was very tough for me," Strycova said after the match. "I was leading 5-2 and two match points; I felt like I wasn't doing anything wrong, but I couldn't take the extra step. I tried some different things at the end and it worked!"

"I'm very glad that we got through," remarked Czech captain Petr Pala. "Even in the first match the score looked quite easy but it was quite tight in the beginning and Karolina put in a great performance and showed she is a great Fed Cup player.

"The second match was tighter. Barbora was using the crowd and the crowd helped us a lot. It wasn't an easy decision for us to play her today because normally she would play doubles."

Standing between the Czechs and a fourth straight final will be the USA, who ousted Germany after CoCo Vandeweghe clinched a 3-0 lead.

Switzerland 4-1 France

Timea Bacsinszky turned the tables on St. Petersburg Ladies Trophy champion Kristina Mladenovic to help lead Switzerland into a second straight Fed Cup semifinal.

Bacsinszky recovered from a tumble to keep Mladenovic from a second straight win over the weekend with an impressive 7-6(4), 4-6, 7-5 win to make the Swiss team anything but neutral.

"I looked really unlucky this week with the medical timeouts, but I fell and injured my knee," she said after the match. "That took me away from tennis for three months last year and so I needed an extra check. In the moment, it's tough becuase you care about your health, see the whole year and don't want to be injured. But I'm ok.

Leading 5-2 in the final set, Mladenovic quickly leveled the decider but the Olympic Silver medalist closed the door in front of her home fans.

"I was just telling myself how privileged I am to play a match like this, and wasn't focused on who was going to win. I'm just so lucky to be playing tennis in front of my country, carrying the Swiss flag.

"It could have gone either way because she played so well at the end. But we both deserved to win because it was such high quality."

In the critical fourth rubber, Belinda Bencic dismissed substitute Pauline Parmentier, 6-3, 6-4, to book an encounter against surprise semifinalists, Belarus.

Belarus 4-1 Netherlands

In a battle of underdogs teams, Belarus roared through the final three rubbers of the tie oust the Netherlands for an emphatic win in Minsk.

After Kiki Bertens helped level the tie on Saturday, Aliaksandra Sasnovich stunned the 2016 French Open semifinalist, 6-3, 6-4 to turn the tie on its head.

Armed with the momentum, Belarus played Aryna Sabalenka, a 19-year-old playing in just her second Fed Cup tie - and only her second singles rubber. Recovering from her loss to Bertens, Sabalenka dispatched Michaella Krajicek, 7-6(5), 6-4 to clinch her country's first semifinal in Fed Cup history.

United States 3-0 Germany

The second day of play began in Maui after only one completed match, but Germany was still up against the wall after Julia Goerges was forced to retire overnight due to her Saturday slip.

Playing Australian Open semifinalist CoCo Vandeweghe, Andrea Petkovic led by a set and a break, but the ailing American caught fire and won the final 10 games of the match to clinch victory.